Can external current pass through Faraday cage,like thunder?

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SUMMARY

The discussion centers on the effectiveness of a Faraday cage in shielding against external electrical currents, such as lightning. An ideal Faraday cage, constructed as an unbroken hollow conducting shell, would completely block external electrical fields. However, practical implementations often use fine mesh materials, which can theoretically allow exceptionally powerful lightning strikes to penetrate. A properly grounded Faraday cage is essential for optimal protection against such events.

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Can external current pass through Faraday cage,like thunder? Will be there electrical field, inside the Faraday cage?
 
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In the ideal case, the Faraday cage should be an unbroken hollow conducting shell. Then there cannot be any electrical field inside due to outside fields. In practice, it is made of fine mesh, and connected to the ground, that is earthed.

A heavy duty properly grounded cage will prevent lightning from passing through. But, theoretically, it's possible to imagine an exceptionally powerful bolt of lightning entering it, because it's a mesh, not an unbroken hollow shell.
 

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